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Yeah, my lineup is a super old manual focus f4 300 mm, a modern production of an old design f1.9 43mm, and a modern f2.8 15-30, 50mmish vintage is relevant because it's a simple design and you're really not getting much more by paying for the latest and greatest, long vintage is relevant specifically on pentax because for full frame the modern options >= 300mm are limited and expensive. Pic related, shot of the super moon with some quick edits on the 300 mm